BCR and chronic myelogenous leukemia, BCR-ABL1 positive: Furthermore, in MLN with FGFR1 rearrangements, translocations involving ZMYM2 are more commonly associated with a T-lymphoblastic lymphoma phenotype, whereas translocations involving BCR tend to lead to a phenotype resembling BCR::ABL1 positive chronic myeloid leukemia [5, 6, 9].